Aggregation-Based Bacterial Separation with Gram-Positive Selectivity by Using a Benzoxaborole-Modified Dendrimer.

Area of Science:

• Environmental microbiology
• Nanotechnology
• Antimicrobial resistance (AMR) research

Background:

• Antimicrobial-resistant (AMR) bacteria pose a critical global health challenge, complicating infectious disease treatment.
• Effective monitoring of AMR necessitates methods for analyzing bacterial distribution in environmental samples.
• Current methods for bacterial separation from environmental matrices are often limited by pH and temperature dependence.

Purpose of the Study:

• To develop a rapid, viable, and selective bacterial separation method.
• To synthesize and utilize a novel nanoprobe for Gram-positive bacterial enrichment.
• To facilitate environmental monitoring of bacteria, particularly in the context of AMR.

Main Methods:

• Chemical synthesis of a metal-free benzoxaborole-based dendrimer probe (BenzoB-PAMAM(+)).
• Utilizing the probe's recognition of Gram-positive bacterial surfaces for aggregation.
• Employing a 10 μm membrane filter for separation of aggregated Gram-positive bacteria.

Main Results:

• BenzoB-PAMAM(+) selectively induced aggregation of Gram-positive bacteria over a wide pH range.
• Gram-positive bacteria were successfully separated and collected using a 10 μm membrane filter.
• Gram-negative bacteria remained in the filtrate, demonstrating high selectivity.

Conclusions:

• The BenzoB-PAMAM(+) nanoprobe offers a viable and selective method for Gram-positive bacterial separation.
• This technique is suitable for biological analyses and environmental monitoring of bacterial distribution.
• The method contributes to addressing the challenge of antimicrobial resistance by improving bacterial analysis capabilities.